/**
 * Copyright (c) 2010 by Kevin Bierhoff.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    1. Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *    3. Neither the names of the authors nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.googlecode.syper.test.javasyp.logic;

import com.googlecode.syper.anno.Excl;
import com.googlecode.syper.anno.Imm;
import com.googlecode.syper.anno.Invariant;
import com.googlecode.syper.anno.Pred;
import com.googlecode.syper.anno.Result;

import edu.cmu.cs.crystal.annotations.FailingTest;
import edu.cmu.cs.crystal.annotations.UseAnalyses;

/**
 * @author kevin
 * @since Feb 21, 2010
 */
@FailingTest(2)
@UseAnalyses("SymbolicChecker")
public class ObjectInvFail implements Invariant {
	
	@Excl private Contained x;
	@Imm private Contained y;
	private boolean pickY;

	public ObjectInvFail(@Imm(borrowed = false) Contained y) {
		x = new Contained(y.get());
		this.y = y;
	}

	@Excl(mod = "pickY")
	@SuppressWarnings("unused")
	public int get() {
		excl: {
			@Result final int result = pickY ? x.get() : y.get();
			pickY = ! pickY;
			return result;
		}
	}
	
	@Excl
	@SuppressWarnings("unused")
	public void set(int i) {
		Pred.requires(0 <= i);
		excl: x.set(i);
	}

	static class Contained {

		private int i;

		Contained(int i) {
			this.i = i;
			Pred.ensures(this.i == i);
		}

		@Imm
		@SuppressWarnings("unused")
		public int get() {
			imm: {
				@Result final int result = i;
				Pred.ensures(result == i);
				return result;
			}
		}

		@Excl(mod = "i")
		@SuppressWarnings("unused")
		public void set(int i) {
			excl: {
				this.i = i;
			}
			Pred.ensures(this.i == i);
		}
	}

	@Imm
	@SuppressWarnings("unused")
	@Override
	public boolean inv() {
		imm: return y.i < x.i;
	}
	
}
